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The library tree-buffer.el is ECB independent and can be used for other applications too. But such an application is not allowed to use any of the variables of tree-buffer.el especially not the variable tree-buffers!
tree-buffers: Only for internal use. It contains all
tree-buffers of current Emacs-instance, means all
tree-buffers of all applications which uses currently
tree-buffers. Every application must store its own collection of
tree-buffers in an own variable! For example: ECB stores its
tree-buffer set in ecb-tree-buffers!
An application may only use the methods tree-buffer.el provides but no internal variables!